VBoot Reference: Output debug information using debug() instead of fprintf().

src/platform/vboot_reference/tests/test_common.c

Index: src/platform/vboot_reference/tests/test_common.c
diff --git a/src/platform/vboot_reference/tests/test_common.c b/src/platform/vboot_reference/tests/test_common.c
index 259131026fb5f1c1ac9b622d2e948fb49d6fc3ad..5fcdc5e799b110b266539a774a38ad6fb1933851 100644
--- a/src/platform/vboot_reference/tests/test_common.c
+++ b/src/platform/vboot_reference/tests/test_common.c
@@ -67,13 +67,13 @@ FirmwareImage* GenerateTestFirmwareImage(int algorithm,
 
   /* Generate and populate signatures. */
   if (!AddFirmwareKeySignature(image, root_key_file)) {
-    fprintf(stderr, "Couldn't create key signature.\n");
+    debug("Couldn't create key signature.\n");
     FirmwareImageFree(image);
     return NULL;
   }
 
   if (!AddFirmwareSignature(image, firmware_key_file)) {
-    fprintf(stderr, "Couldn't create firmware and preamble signature.\n");
+    debug("Couldn't create firmware and preamble signature.\n");
     FirmwareImageFree(image);
     return NULL;
   }
@@ -178,13 +178,13 @@ KernelImage* GenerateTestKernelImage(int firmware_sign_algorithm,
 
   /* Generate and populate signatures. */
   if (!AddKernelKeySignature(image, firmware_key_file)) {
-    fprintf(stderr, "Couldn't create key signature.\n");
+    debug("Couldn't create key signature.\n");
     KernelImageFree(image);
     return NULL;
   }
 
   if (!AddKernelSignature(image, kernel_key_file)) {
-    fprintf(stderr, "Couldn't create kernel option and kernel signature.\n");
+    debug("Couldn't create kernel option and kernel signature.\n");
     KernelImageFree(image);
     return NULL;
   }